summaryrefslogtreecommitdiffstats
path: root/drivers/usb/class/cdc-acm.h
blob: 94266362ca68a80c50606a63515791a0d9cf2cec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 *
 * Includes for cdc-acm.c
 *
 * Mainly take from usbnet's cdc-ether part
 *
 */

/*
 * CMSPAR, some architectures can't have space and mark parity.
 */

#ifndef CMSPAR
#define CMSPAR			0
#endif

/*
 * Major and minor numbers.
 */

#define ACM_TTY_MAJOR		166
#define ACM_TTY_MINORS		32

/*
 * Requests.
 */

#define USB_RT_ACM		(USB_TYPE_CLASS | USB_RECIP_INTERFACE)

/*
 * Output control lines.
 */

#define ACM_CTRL_DTR		0x01
#define ACM_CTRL_RTS		0x02

/*
 * Input control lines and line errors.
 */

#define ACM_CTRL_DCD		0x01
#define ACM_CTRL_DSR		0x02
#define ACM_CTRL_BRK		0x04
#define ACM_CTRL_RI		0x08

#define ACM_CTRL_FRAMING	0x10
#define ACM_CTRL_PARITY		0x20
#define ACM_CTRL_OVERRUN	0x40

/*
 * Internal driver structures.
 */

/*
 * The only reason to have several buffers is to accomodate assumptions
 * in line disciplines. They ask for empty space amount, receive our URB size,
 * and proceed to issue several 1-character writes, assuming they will fit.
 * The very first write takes a complete URB. Fortunately, this only happens
 * when processing onlcr, so we only need 2 buffers. These values must be
 * powers of 2.
 */
#define ACM_NW  16
#define ACM_NR  16

struct acm_wb {
	unsigned char *buf;
	dma_addr_t dmah;
	int len;
	int use;
	struct urb		*urb;
	struct acm		*instance;
};

struct acm_rb {
	struct list_head	list;
	int			size;
	unsigned char		*base;
	dma_addr_t		dma;
};

struct acm_ru {
	struct list_head	list;
	struct acm_rb		*buffer;
	struct urb		*urb;
	struct acm		*instance;
};

struct acm {
	struct usb_device *dev;				/* the corresponding usb device */
	struct usb_interface *control;			/* control interface */
	struct usb_interface *data;			/* data interface */
	struct tty_struct *tty;				/* the corresponding tty */
	struct urb *ctrlurb;			/* urbs */
	u8 *ctrl_buffer;				/* buffers of urbs */
	dma_addr_t ctrl_dma;				/* dma handles of buffers */
	u8 *country_codes;				/* country codes from device */
	unsigned int country_code_size;			/* size of this buffer */
	unsigned int country_rel_date;			/* release date of version */
	struct acm_wb wb[ACM_NW];
	struct acm_ru ru[ACM_NR];
	struct acm_rb rb[ACM_NR];
	int rx_buflimit;
	int rx_endpoint;
	spinlock_t read_lock;
	struct list_head spare_read_urbs;
	struct list_head spare_read_bufs;
	struct list_head filled_read_bufs;
	int write_used;					/* number of non-empty write buffers */
	int processing;
	int transmitting;
	spinlock_t write_lock;
	struct mutex mutex;
	struct usb_cdc_line_coding line;		/* bits, stop, parity */
	struct work_struct work;			/* work queue entry for line discipline waking up */
	struct work_struct waker;
	struct tasklet_struct urb_task;                 /* rx processing */
	spinlock_t throttle_lock;			/* synchronize throtteling and read callback */
	unsigned int ctrlin;				/* input control lines (DCD, DSR, RI, break, overruns) */
	unsigned int ctrlout;				/* output control lines (DTR, RTS) */
	unsigned int writesize;				/* max packet size for the output bulk endpoint */
	unsigned int readsize,ctrlsize;			/* buffer sizes for freeing */
	unsigned int used;				/* someone has this acm's device open */
	unsigned int minor;				/* acm minor number */
	unsigned char throttle;				/* throttled by tty layer */
	unsigned char clocal;				/* termios CLOCAL */
	unsigned int ctrl_caps;				/* control capabilities from the class specific header */
	unsigned int susp_count;			/* number of suspended interfaces */
	struct acm_wb *delayed_wb;			/* write queued for a device about to be woken */
};

#define CDC_DATA_INTERFACE_TYPE	0x0a

/* constants describing various quirks and errors */
#define NO_UNION_NORMAL			1
#define SINGLE_RX_URB			2